Fix workflows, Add run tests on Unity 6

[nowsprinting]

Changes

• Add timeout-minutes
• Add github.ref into cache key
• Mod run tests Unity version matrix, Add Unity 6

[github-actions]

Code Metrics Report

	master (b18c32a)	#99 (f011e47)	+/-
Coverage	72.3%	72.3%	0.0%
Code to Test Ratio	1:0.9	1:0.9	0.0
Test Execution Time	5m1s	2m48s	-2m13s

Details

  |                     | master (b18c32a) | #99 (f011e47) |  +/-   |
  |---------------------|------------------|---------------|--------|
  | Coverage            |            72.3% |         72.3% |   0.0% |
  |   Files             |               27 |            27 |      0 |
  |   Lines             |              668 |           668 |      0 |
  |   Covered           |              483 |           483 |      0 |
  | Code to Test Ratio  |            1:0.9 |         1:0.9 |    0.0 |
  |   Code              |             1291 |          1291 |      0 |
  |   Test              |             1206 |          1206 |      0 |
+ | Test Execution Time |             5m1s |         2m48s | -2m13s |

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Reported by octocov